Release Notes: Fallback MX records are now sorted by priority, and IPv6
addresses are delivered before IPv4 addresses by default. A
binding for the Lua language has been added, and specific
support for HTTP queries has been added.

Release Notes: IPv6 support has been added to testing tools, Perl and PHP bindings have
been updated to a new address-family-aware API, and a pointer arithmetic
bug in ruli_getaddrinfo() has been fixed.

Release Notes: The API was changed to support multiple address families.
Binary compatibility was broken, and applications requiring the
previous API must stick with 0.21. Experimental support for
IPv6 transport was added, and a getaddrinfo(3) compatible
interface was included.